I have waste'd the antifreeze from my system and everything is set to turn the filter on. However, when I turn the multi-port to filter and run the pump I get water coming out of a mysterious outlet. I don't know what this outlet is used for or why water would be running through it. It isn't my backwash line, I have labeled that as blue in the photo.
In the attached photo the blue line is my backwash, that works properly when I set the multiport to backwash. The red outlet is shooting out water when I set the multiport to filter. The PVC comes out of the ground I don't know where it connects to the overall circulation system. Of course I have not had this problem before.
Any help is appreciated, I hope everyone is having a wonderful pool start season.